A new analysis from the University of Virginia Center for Politics shows a shift in the U.S. electoral map that helps Donald Trump and makes Hillary Clinton's position "much more precarious" than it was six months ago.

According to "Larry Sabato's Crystal Ball," third-party candidates have gained momentum in swing states, Clinton has suffered from a disastrous few weeks on the campaign trail, and Trump has benefited from a new campaign team that has kept the GOP nominee more on message.

"Donald Trump has surged in some swing states and at the same time importantly, really, Hillary Clinton has fallen off more perhaps than Trump has even surged. So that's another explanation to why the race has tightened so much. She has lost some support."

The "Crystal Ball" changes to its Electoral College map include:

Florida, Nevada, and North Carolina move from "Leans Democratic" to "Toss-up."

A new analysis from the University of Virginia Center for Politics shows a shift in the U.S. electoral map that helps Donald Trump and makes Hillary Clinton's position "much more precarious" than it was six months ago.